Well, thanks to you, we now have a review.
Never heard the Advent Maestro, Legacy or Heritage or Laureate. And so, I could never render a "hands on" review.
However, I've heard Baby Advent II's a couple of times in different locations and they were really nice. Plenty of bass, not very detailed but very balanced and very pleasant.
Over the years, I have read a large number of articles on Advents and the ones that are still in demand (somewhat) are the Original Advent, New large Adevent, 5012 & 25th Anniversary edition. I still own the Original Advent (walnut). An exceptional speaker for it's time. My only knock is the highs can get screechy.
And of course - the double or stacked Advent. Unfortunately, I've never heard them. A big deal way back when.